Those states that do consume the most porn tend to be more conservative and religious than states with lower levels of consumption, the study finds.

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Residents of 27 states that passed laws banning gay marriages boasted 11% more porn subscribers than states that don't explicitly restrict gay marriage.

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States where a majority of residents agreed with the statement "I have old-fashioned values about family and marriage," bought 3.6 more subscriptions per thousand people than states where a majority disagreed. A similar difference emerged for the statement "AIDS might be God's punishment for immoral sexual behaviour."